“We’re pioneering something,” says the former NBA star and founder of Viola cannabis, who says he wants to create 100 Black millionaires by funding new businesses. At the end of 2011, Al Harrington’s 79-year-old grandmother Viola came to visit. When the Denver Nuggets star discovered that she was taking multiple medications for glaucoma, diabetes, and high blood pressure, he told her that he’d recently read about treating glaucoma with cannabis, and asked if she’d consider…